This volume presents the papers from the first workshop on perceptual issues in visualization. It addresses the issues and problems of creating perceptually-based presentations and presents innovative approaches to achieving such presentations. Through many examples, it describes color, geometric, and sound approaches to perceptually-based presentations. It suggests some guidelines and "dos and dont's" for such presentations. It discusses methods to evaluate them to ascertain their efficacy. And it explores the interactions with such presentations, once attained, and with the data they present.